ALLEN PARK -- The Detroit Lions have placed rookie cornerback Bill Bentley on injured reserve because of his hurt shoulder.

As a result, Detroit has re-signed safety Don Carey.

Bentley was a third-round draft pick by Detroit this season and supposed to replace Eric Wright, who signed with the Tampa Bay Buccaneers as a free agent. Lions cornerback Alphonso Smith entered training camp as the number one right cornerback, but Bentley took over that spot within a few days.

However, Bentley was unable to avoid injuries in his first NFL season.

Bentley sustained a concussion in Week 1 against the St. Louis Rams. That injury forced him to miss Detroit's next game against the San Francisco 49ers, but he returned the following week against Tennessee. Bentley starter against Minnesota and injured his shoulder against the Philadelphia Eagles on October 14.

He finishes this season with 15 tackles.

Lions coach Jim Schwartz was asked about safety Louis Delmas and Bentley's long-term health yesterday, and he said both players were day-to-day.

"Both of them are probably the same," Schwartz said. "Both of them are day-to-day, and they're battling through some things that they're working. Bentley's shoulders and Louis' knees."

Carey, a Grand Rapids native, was waived/injured due to a hamstring injury this past August. He signed with the Lions in October last year after being cut by the Jacksonville Jaguars prior to the start of the season. He appeared in five games for the Lions, seeing limited action as a cornerback.